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PHOENIX -- Arizona Attorney General Tom Horne has announced the indictments of 21 members of the Arizona Air National Guard.

Eight officers and 13 enlisted men and women who served in the 214th Reconnaissance Group are accused of falsifying records to fraudulently receive extra pay.

The charges were announced Monday after an 18-month investigation by state and federal agencies.

Horne said those charged are accused of falsifying their records and using fake home addresses in order to receive money meant for those traveling outside of their home regions. He said most of the defendants fraudulently claimed to live outside Tucson.

Horne said the defendants are accused of defrauding the federal government out of more than $1.4 million. Over the course of three years, the majority fraudulently took home more than $100,000.

They each face up to 12.5 years in prison. The former commander of the 214th RG faces more time because he allegedly participated and helped facilitate the fraud.

Only eight are still active with the Guard and all are from Davis-Monthan Air Force Base.

The investigation was a joint effort by the Attorney General's Office, the FBI, the U.S. Air Force, the Arizona National Guard and the Air National Guard.